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Process and apparatus for recovering olefins

a technology of olefins and processing equipment, applied in the direction of hydrocarbon oil cracking process, gaseous mixture working up, separation process, etc., can solve the problems of large cost and added operating cost of downstream separation equipment, olefin recovery plants relating, and the presence of rich absorber solvents

Active Publication Date: 2007-09-25
EXXONMOBIL CHEM PAT INC
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  • Abstract
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AI Technical Summary

Problems solved by technology

A major drawback related to the operation of the above-described olefin recovery plants relates to high-energy demands.
Compression, ethylene refrigeration and propylene refrigeration are major contributors to this energy consumption.
One drawback related to the use of such an absorber solvent system is that the rich absorber solvent typically contains a small, but valuable amount of desired product (e.g., ethylene) in addition to the unwanted methane.
Huge expense and added operating costs can be incurred in downstream separation equipment required to separate the wanted (e.g., ethylene) products from the rich absorber solvent.

Method used

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  • Process and apparatus for recovering olefins
  • Process and apparatus for recovering olefins

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Embodiment Construction

[0041]The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented to provide what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.

[0042]As is well known and within the skill of the art, when reference is made to a specific hydrocarbon stream, e.g., a C4 stream, it is not practical or intended that such reference is strictly limited to a pure C4 stream, since other components, albeit in small amounts, will also be present (e.g., C3 will be present in a small amount in a stream designated ...

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Abstract

The present invention relates to a process and apparatus for recovering product from reactor effluent of a reactor for a hydrocarbon feedstream. An indigenous C4 stream is used as lean oil in a demethanizer, which facilitates significant cost and operational savings. C4 bottoms from a downstream depropanizer is used as lean oil recycle.

Description

BACKGROUND OF THE INVENTION[0001]Olefins find widespread uses in many industries. For example, they represent the basic building blocks in such diverse uses as film and packaging, communications, construction, automotive and home appliances. These important materials are generally produced by the cracking of a hydrocarbon feedstream, which converts saturated hydrocarbons present in the feedstream into olefins.[0002]Current cracking technologies for the production of light olefins (e.g. ethylene, propylene and, optionally, butylenes), gasoline and other cracked products such as light paraffins and naphtha can be classified into the two categories of thermal cracking (also known as steam cracking) and catalytic cracking. These technologies have been practiced for many years and are considered the workhorses for light-olefin production.[0003]Steam or thermal cracking, a robust technology that does not utilize catalyst, produces the more valuable ethylene as the primary light olefin pro...

Claims

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Application Information

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IPC IPC(8): C10G9/00C10G70/06
CPCC10G70/06Y02P30/40
Inventor DUHON, DAVID J.ASPLIN, JOHN E.
Owner EXXONMOBIL CHEM PAT INC
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